Question about 2002 GMC Envoy

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Engine lopes while idling or idles erratically

The first time it did that, I replaced the spark plugs and still the same. Next thing I did is I replaced the the fuel filter and still the same.

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1.vacuum leak
2.leaking egr or plugged pcv valve
3.ignition components damp or damaged
4.faulty or incorrectly gapped spark plugs
5.faulty plug wires
6.faulty emmission components
7.air filtr clogged
8.leaking head gasket
9.timing chain or gears worn
first check air filter then check timing with a light make sure its steady if it bounces around the your chain/belt is needing replaced check your wires for frays or just replace them cause their 10 years old

Posted on Feb 10, 2009

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2 Answers

Why does idle fluctuate from 800 rpm to1500 rpm


this is what they call engine loping u need to take it to a mech for proper diagnostic,,, bu check first spark plugs and wires mostly culprit though is timing bad,,,, bad timimg gear/belt/chain which ever is in yours.

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The problem: 2001 mitsubishi galant es will not continue to run first start up in the morning


For idle issue,click the help links provided below :---

Bad miss at idle? http://technoanswers.blogspot.com/2012/01/bad-miss-at-idle.html---------- Engine stumbles coming off idle when warm?

http://repairhelpcenter.blogspot.com/2012/01/engine-stumbles-coming-off-idle-when.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Idle flair is noticed on car? Rough idle? car will not idle? Erratic idle speed?

http://technoanswers.blogspot.in/2012/02/idle-flair-is-noticed-on-car-rough-idle.html

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Idle Air Control (IAC) Valve Replacing?

http://schematicsdiagram.blogspot.com/2011/12/gmc-idle-air-control-iac-valve.html

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Car not starting or turning over indicates towards multiple possibilities. It can be issue with battery or weak battery. But if battery checks out ok, then it can be starter issue or faulty alternator or problem with low fuel pressure or no spark at spark plugs due to dirty spark plugs or faulty ignition coil or injectors getting cracked or dirty and needs to be cleaned.


To confirm the problem, the basic troubleshooting is required.


Click this link below and follow the troubleshooting:------

http://technoanswers.blogspot.in/2012/02/car-starting-issues.html

---------

This will help.

Thanks.

Feb 26, 2012 | 2001 Mitsubishi Galant

1 Answer

Won't start fuel pump replaced new tank and relay have fuel after fuel filter runs if I put fuel down throttle body. this is on a4,3.


Nephew had similar problem on different vehicle - had spark to plugs, limited gas, everthing else checked. I did one thing first - check for two fuel filters - one in the tank was only screens and one in the line itself. Found a little in line filter just outside of engine compartment under car next to frame that looked like it had never been changed - partially clogged - replaced it.Almost ran but would not keep running. I had rotor and cap pulled - found that the screw holding rotor in place was loose. The rotor edge next to plug wire leads was chopped up and the cap's plug wire leads were heavily oxidized. Replaced them and got it running but a little rough. Pulled the spark plugs and found gaps from 25 - 100 ---replaced the plugs with correct gapping and it ran really well.

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1 Answer

Rough idling/loping at idle it otherwise runs fine off idle.


1. Vacuum leakage Check throttle body and intake manifold for tightness. check all vacuum hoses.
2. Faulty fuel or pump or electrical.
3. Plugged PVC valve.
4. Air filter clogged
5. Leaking head gasket.
6. Camshaft lobs worn.
All of these porblems can cause lopes or erratic idle.

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2 Answers

Engine idles rough at red lights begins loping rpms drop to almost killing, then cycles back to normal, then repeats rough idle drop in rpms and loping, back and forth until I rev engine or take off


You could have a clogged fuel filter, if you haven't changed it in awhile. You could have a leak in the intake system somwhere also. When you slow down, you get less power to the engine. It may need spark plugs and wires as well, if in need for a tune up.

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I have a 1988 Volvo 740 GLE non-turbo with a problem. The car Idles fine, When you give it gas slowly it revs up slowly, but when you step on it, it like chokes out and back fires. I've replaced the Fuel...


you should have two fuel filters on that car one under the car on the fuel line it sounds like its not getting fuel right when did this start after the plug and wire change or after the timeing or after the fuel rail thing have a fuel pressure test done on it

Dec 01, 2010 | 1988 Volvo 740

1 Answer

I just replaced the water pump, timing belt, Coil packs, spark plugs, air filter, and fuel filter. The car will not start even with starting fluid sprayed in the injector ports. Is the timing off, or is...


Your problem could be cause by either, both or neither. Start by checking the easiest things first. Check that the spark plug wires are connected in the proper firing order. The firing order is 1-3-4-2.

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Next check that all of the plugs that were removed are firmly plugged in. Even check the ones you did not remove, just in case.

Next check that you get fuel and spark. Although it is not conclusive, if you smell fuel out of the exhaust, you are probably getting fuel. The best way is to use a fuel pressure gauge to make sure you are getting fuel at the correct pressure. Typically, base fuel pressure is in the neighborhood of 42 psi with the vacuum line disconnected from the pressure regulator. For spark, a quick test is to remove a plug, connect it to the spark plug wire, firmly ground the metal body of the spark plug, crank the engine and observe the gap for spark. This does not tell you the quality of the spark, it only tells you that there is a spark being produced but may not be hot enough to ignite the fuel. If you are not getting a spark, troubleshoot and repair before proceeding.

If all of the above have been done and it still does not start, than check that the timing marks line up.
Post up a follow up if the timing marks are lined up properly.

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I can't solve the problem for you, but I can definitely tell you that it is NOT the fuel filter. I just replaced mine, and it's still doing the same thing, a full day after replacing. Looks like we're in the same boat. I'm changing the spark plugs next. Maybe we can help each other out here. What's your next move?

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My truck is a 1998 ford f250 4wd, 5.4l engine. I have been having some problems where at idle (like at a light) it will idle very erratic, and very low. I recently replaced my mass air flow sensor, my...


I would tell you to stop guessing and throwing parts on that you dont need. First have it scanned and see if there are any trouble codes. you need to replace the ALL the spark plugs, Use only Motorcraft or Autolite platinum spark plugs gapped properly. . Be careful as coils are a common weak item , and are about $95 each. the Idle Air Control (IAC) solenoids are common to go bad also (controls idle speed)

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